Xu, Si-Wei; Wang, Rongping; Yang, Zhiyong; Wang, Li; Luther-Davies, Barry
We prepared five samples of chemically stoichiometric GexAsySe1-x-y glasses in order to examine whether homopolar bonds exist in these glasses. It is generally accepted that the structure of these chemically stoichiometric glasses should be dominated by GeSe4/2 tetrahedra and AsSe3/2 pyramids with a negligible quantity of homopolar bonds. Analysis of Raman scattering and X-ray photoelectron spectra of the glasses indicates that, while glasses located at the center of the glass-forming region...[Show more]
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